Canadian Basic pool, section 6-12

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Subelement 6

Feedlines and Antenna Systems

Section 6-12

wire antennas - types, dimensions, characteristics

6-12-01

If you made a half-wavelength dipole antenna for 28.550 MHz, how long would it be?

A.
10.5 metres (34.37 ft)
B.
28.55 metres (93.45 ft)
C.
5.08 metres (16.62 ft)
Correct Answer
D.
10.16 metres (33.26 ft)

6-12-01

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6-12-02

What is one disadvantage of a random wire antenna?

A.
It usually produces vertically polarized radiation
B.
It must be longer than 1 wavelength
Correct Answer
C.
You may experience RF feedback in your station
D.
You must use an inverted T matching network for multi-band operation

6-12-02

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6-12-03

What is the low angle radiation pattern of an ideal half-wavelength dipole HF antenna installed parallel to the earth?

Correct Answer
A.
It is a figure-eight, perpendicular to the antenna
B.
It is a circle (equal radiation in all directions)
C.
It is two smaller lobes on one side of the antenna, and one larger lobe on the other side
D.
It is a figure-eight, off both ends of the antenna

6-12-03

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6-12-04

The impedances in ohms at the feed point of the dipole and folded dipole are, respectively:

A.
73 and 150
Correct Answer
B.
73 and 300
C.
52 and 100
D.
52 and 200

6-12-04

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6-12-05

A dipole transmitting antenna, placed so that the ends are pointing North/South, radiates:

A.
mostly to the South and North
B.
mostly to the South
C.
equally in all directions
Correct Answer
D.
mostly to the East and West

6-12-05

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6-12-06

How does the bandwidth of a folded dipole antenna compare with that of a simple dipole antenna?

A.
It is essentially the same
B.
It is less than 50%
C.
It is 0.707 times the bandwidth
Correct Answer
D.
It is greater

6-12-06

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6-12-07

What is a disadvantage of using an antenna equipped with traps?

A.
It is too sharply directional at lower frequencies
Correct Answer
B.
It will radiate harmonics
C.
It must be neutralized
D.
It can only be used for one band

6-12-07

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6-12-08

What is an advantage of using a trap antenna?

Correct Answer
A.
It may be used for multi- band operation
B.
It has high directivity at the higher frequencies
C.
It has high gain
D.
It minimizes harmonic radiation

6-12-08

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6-12-09

The "doublet antenna" is the most common in the amateur service. If you were to cut this antenna for 3.75 MHz, what would be its approximate length?

Correct Answer
A.
38 meters (125 ft.)
B.
32 meters (105 ft.)
C.
45 meters (145 ft.)
D.
75 meters (245 ft.)

6-12-09

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